Combustion engine valve operating means



Sept. 16, 1952 P L K 2,610,617

' COMBUSTION ENGINE VALVE OPERATING MEANS Filed Oct. 5, 1949 2 SHEET-S SHEET l T 5 l6 9 I INVENTOR USTAV- P ELSTICK ATTORNEYS Sept. 16,1952 G. PIELSTICK 2,610,617

I COMBUSTION ENGINE VALVE OPERATING M ANS Filed Oct. 5, 1949 2 SHEETS-SHEET 2 9- 4 mvNToR G'USTAV PIELSTICK AT T0 RA/EKS Patented Sept. 16, 1952 coMnUs'rIoN ENGINE vALvn'orEaArIN MEANS I Gustav Pielstick, Saint-GermaineneLaye, France Application October 5, 1949, Serial No. 119,610

v In France October 12, 1948 2 Glaima; (strea -9e) This invention relates to valve-operating means for operating the intake and exhaust-valves of internal combustion engines and the like. The invention is more particularly j directed ,tolsuch engines of the four-stroke'type including twointake andtwo exhaust valves. V

In four stroke engines in'which the cylinder head comprises FT'WO :intake:. and two exhaust valves, .thevalves are generally operated by two pairs of interconnected rocker levers, or by a group. of valve-operating "levers provided "with bearing. supports and rocker pivots at different vertica1' heights; Whatever the particular ar- 1 rangement used however the numberof such bearings and pivots in conventional engines is high and consumes much space on the cylinder head, and accessibility of the valves is seriously impaired.-

It is a general object of this invention to overcome this drawback and provide an improved operating assembly for the intake and exhaust valves of a combustion engine.

It is an object to provide an operating rocker leverage for operating the valves of such an engine which is simpler in operation, and provides freer access to the valves, than in prior art.

Another object is to provide such a leverage which is improved in that it includes a lower number of pivotal parts. 1

With the above and further objects in view, 1 provide a valve-operating leverage of the type described which essentially comprises a rocker lever to operate the exhaust valves, said rocker lever comprising integral angularly displaced arms in equal number to said exhaust valves extending from acommon oppositely-projecting arm adapted to be actuated by a tappet or the like. Preferably said arms form a fork with each rocker niay be operated from respective tappets, and these tappets may'extend higher at an angle to the vertical or vertically. In the first case the parallel-spaced arms of the intake rocker are preferably interconnected by the actual commonrocker shaft thereof, while in the second case the arrangement is such as to make it preferable to provide said integrally'interconnecting means for the parallel spaced intake rocker arms in the form of a bridging member. The rocker shaft for the intake rocker may be both vertically and horizontally offset with respect to that of the exhaust rocker, .and preferably the intake rocker shaft is displaced in a horizontal plane divergent tines symmetrically disposed with re I spect to a radial plane of the cylinder. The intake-operating rocker means may according to the invention comprise a plurality of parallel, spaced integral arms in equal number to said intake valves and a common integral oppositely extending arm adapted to be actuated by a related tapp-et or the like. Preferably said parallelspaced arms are symmetrically disposed on each side of said radial plane and of the said common oppositely-extending arm of the exhaust-operating rocker, while said oppositely-extending arm of the intake-operating rocker is offset to one side of said plane. The rocker shafts for said intake and said exhaust rocker means may be mounted on a common support or on separate supports. The said oppositely-extending arms of radially outwardly'of the exhaust rocker. shaft.

Further features of my invention will appear as the description proceeds.

Exemplary embodiments of the invention will now be described in greater detail, by way of illustration and not of limitation, with reference to the accompanying drawings, in which:

Fig. 1 is an overhead plan view of a first embodiment, showing the improved valve-operating means of my invention as applied to a four-valve engine;

Fig. 2 is a partial view in sectional elevation on line 11-11 of Fig. 1;

Fig. 3 is a partial sectional elevation on line III-III of Fig. 1;

Fig. 4 is an overhead plan view relating to a modification and Fig. 5 is a sectional elevation on line V-V of Fig. 4. V

As shown in Figs. 1 to 3, a combustion engine cylinder head I comprises an injection nozzle 2, 1 two intake valves 3, 4 and two exhaust valves 5, 6. The intake valves 3, 4 are operated by av pair of respective levers l 8 pivoted on a common shaft 9. The shaft 9 is actuated through a single lever arm ID by a valve-lifter or tappet H. The exhaustvalves 5, 6 are operated by a fork-shaped lever l2 which includes two integral lever-arms or tines i3; M angularly displaced in a horizontal plane from each other, extending from a common opposite arm 12. The exhaust valve operating lever l2l3-l l is pivoted on a rocker shaft l5 and its arm I2 is actuated by the exhaust tappet 15. It will be noted that the exhaust-valve operating lever arms or tines 53, i i are of equal length and are symmetrically disposed on each side of the injector nozzle 2, and also that the entire arrangement of intakeand exhaust-valve actuating lever arms I, 8 and Hi, It as a Whole is symmetrical about a diametric plane of the cylinder head.

The pivot shaft d for the intake-rocker is horizontally offset from the pivot shaft i5 for the exhaust-rocker. Both pivot shafts however as here shown are supported on a common mounting support I1, as shown in Fig. 2. The tappets II and [6 for the intake and exhaust rockers respectively are in this embodiment inclined at an angle to the vertical.

The embodimentillustrated in 7 Figs.- A sand 5 differs "from'the one 'just described mainly in pivot axes being situated on said rockers substantially midway between the points of these latter acted upon by the push rods and acting upon the valves, the said rockers having each at least two arms each of which corresponds to a respective valve, the contact points of said push rods and rockers being situated on a line which .is;substantiallyparallel to the longitudinal axis oftheengine and forms an, acute angle with the that the respective rocker members 1-8 for the 10 pivot axes of said rockers, said latter axes being intake valves and |2-l3--|4 for the exhaust valves are so formed as toc-bezactuatednby'rvertically extending tappets H and I6 respectively. In this embodiment the intake rocker arms I *substantially perpendicular with respect to the ggeneralzlong-itudinal direction of these rockers.

2. Assembly according to claim 1 wherein a single .support isprovided for the mounting of and 8 ar int ally n t d y a rid ing '"both='said';individua1"pivot means.

member 18 having an integral bridging 31301 tion 19.

It will of course be understood that various modifications may be made in the structural de- GUSTAV PIELSTICK.

REFERENCES CITED The'following references are of record in the tails of the exemplary embodiments shown with- 20 fil f this patent;

out-departingiiromatheascopetof theinvention whatl claimiisz :1. "In a valve:.operating::assembly za'daptedifor use in an' internalrcombustiomengine: havingaat least two exhaust aandi twoiinlet rvalvesitwo :sep- 115933832 arate rooker' means for'the:actuationmespectively of the exhaust and inletlvalves -oftthesengine an individual pivotmeans ioiv each one of said-rook- -ers, theaxes of :said pivot means being separated by a certain distance and iocatedsat the same '30 Number horizontal level, and pusher-ed mean's flocated alongside the .cylinder andadapted to: act :on: one end of said rockers so --as to :cause their tilting and thereby the control of the' 'valves b 1 their other --ends beyond I the pi-vot axes,tthese platter 'UNI'IIED STATES; PA'IENTS Number ;I Iame 'Date ,;J.,2845,250 ZCurtiss l, Nov. ,12, .1918 3Zincentl Dec.-oe1,o1928 2,000,248 Moore; :May ,7, 1935 "23475346 jfIiaylor .:.I u1y, 14, 1,1936

'FFGRElIGN PATENTS t'Qountry "Date $503,282 7 France .June '7, .1920 545L229 Erance, -jJune 16, .1922 v842x922- ,Francel .Apr. 13, .1938 3482,1215 -.Greatl1Britain.l Z Nov..26, -1938 

